ITU-T T Series: Terminals for telematic services


Rec. ITU-T T.83 | Rec. ITU-T T.87 | Rec. ITU-T T.802 | Rec. ITU-T T.803 | Rec. ITU-T T.808 | Rec. ITU-T T.834 | Rec. ITU-T T.870

Recommendation ITU-T T.83: Digital compression and coding of continuous-tone still images: Compliance testing

Rec. ITU-T T.83 | ISO/IEC 10918-2 is concerned with compliance tests for the continuous-tone still image encoding processes, decoding processes, and compressed data formats formats that are specified in Rec. ITU-T T.81|ISO/IEC 10918-1. It is published as two parts, described below.
Rec. ITU-T T.81 | ISO/IEC 10918-1, "Requirements and guidelines", sets out requirements and implementation guidelines for continuous-tone, still image encoding and decoding processes, and for the coded representation of compressed image data. These processes and representations are intended to be generic, that is, to be applicable to a broad range of applications for colour and grayscale still images within communications and computer systems.
Rec. ITU-T T.83 | ISO/IEC 10918-2, "Compliance testing", sets out tests for determining whether implementations comply with the requirements for the various encoding and decoding processes specified in Rec. ITU-T T.81 | ISO/IEC 10918-1.
Rec. ITU-T T.83 | ISO/IEC 10918-2 also specifies tests for determining whether any specific instance of compressed data complies with the Rec. ITU-T T.81 | ISO/IEC 10918-1 specification for compressed data format.

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Recommendation ITU-T T.87: Lossless and near-lossless compression of continuous-tone still images - Baseline

Rec. ITU-T T.87|ISO/IEC 199806-I defines a set of lossless (bit-preserving) and nearly lossless (error for each reconstructed sample is bounded by a pre-defined value) compression methods for coding continuous-tone, gray-scale, or colour digital still images.
This ITU-T Recommendation | ISO/IEC International Standard:
  • specifies a process for converting source image data to compressed image data;
  • specifies processes for converting compressed image data to reconstructed image data;
  • specifies coded representations for compressed image data;
  • provides guidance on how to implement these processes in practice.
The compressed images are provided to help testers/developers debug their JPEG-LS implementations. The testing images contain a mixture of data that will exercise many paths in the compression/decompression algorithms. There is no guarantee, however, that every path of the algorithm is tested. The testing images should not be used to benchmark compression capability. They are designed to be "hard" on the JPEG-LS compressor (jpeg-ls may do worse than your favorite compressor on the test images).

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Recommendation ITU-T T.802: JPEG 2000 image coding system: Motion JPEG 2000

Rec. ITU-T T.802|ISO/IEC 15444-3 is the consequent revision of the Motion JPEG 2000 specification, based on the common text of the MP4 and MJ2 formats, which is called the ISO Base Media File Format.
This Recommendation | International Standard specifies the use of the wavelet-based JPEG 2000 codec for the coding and display of timed sequences of images. In this Recommendation | International Standard, a file format is defined, and guidelines for the use of the JPEG 2000 codec for timed sequences are supplied. The Motion JPEG 2000 file format MJ2 is designed to compose within a single presentation one or more motion sequences of JPEG 2000 images, together with their timing and optional audio annotations.
Motion JPEG 2000 is expected to be used in a variety of applications, particularly where the codec is already available for other reasons, or where a high-quality frame-based approach, with no inter-frame coding, is appropriate. These application areas include:
  • digital still cameras;
  • error-prone environments such as wireless and the Internet;
  • PC-based video capturing;
  • high-quality digital video recording for professional broadcasting and motion picture production from film-based to digital systems; and
  • high-resolution medical and satellite imaging.
Motion JPEG 2000 is a flexible format, permitting a wide variety of usages, such as editing, display, interchange, and streaming.

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Recommendation ITU-T T.803: JPEG 2000 image coding system: Conformance testing

Rec. ITU-T T.803:
  • specifies compliance testing procedures for encoding and decoding using JPEG 2000 Part 1 (Rec. ITU-T T.800 | ISO/IEC 15444-1);
  • specifies codestreams, decoded images, and error metrics to be used with the testing procedures;
  • specifies abstract test suites;
  • provides guidance for creating an encoder compliance test.

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Recommendation ITU-T T.808: Information technology JPEG 2000 image coding system: Interactivity tools, APIs and protocols

Rec. ITU-T T.808 purpose is to provide a network protocol that allows for the interactive and progressive transmission of JPEG 2000 coded data and files from a server to a client. This protocol allows a client to request only the portions of an image (by region, quality or resolution level) that are applicable to the client's needs. The protocol also allows the client to access metadata or other content from the file.
Amendment 4 to ITU-T Rec. T.808 (2005) | ISO/IEC 15444-9:2005 defines the framework, concepts and methodology for establishing JPIP interoperability and the criteria to be achieved to claim compliance to ITU-T T.808 | ISO/IEC 15444-9. This amendment defines JPIP profiles and variants. Profiles define the fields that a JPIP server is expected to implement and support beyond parsing and interpretation; profiles also limit the requests a client can expect a server within this profile to support and fully implement. Variants define which features of the JPIP standard are used to request and transmit data between client and server. Servers are classified according to the highest level profile they support, and all the variants they implement. Clients are classified according to all the variants they implement, and according to the highest level profile they support. A new Annex is also included in this amendment that defines a methodology for testing compliance within the set of defined profiles and variants. Test data and scripts for JPIP testing are provided as an integral part of this Amendment.

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Recommendation ITU-T T.834: Information technology - JPEG XR image coding system - Conformance testing

Rec. ITU-T T.834 specifies tests designed to verify whether codestreams, files, encoders, and decoders meet the normative requirements specified in Rec. ITU-T T.832 | ISO/IEC 29199-2 (Information technology - JPEG XR image coding system - Image coding specification).

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Recommendation ITU-T T.870: Lossless and near-lossless compression of continuous-tone still images: Extensions

Rec. ITU-T T.870 defines a set of lossless (bit-preserving) and nearly lossless (error for each reconstructed sample is bounded by a predefined value) compression methods for coding continuous-tone (including bi-level), gray-scale, or color digital still images.
This Recommendation | International Standard:
  • specifies extensions (including arithmetic coding, extension of near lossless coding, extension of prediction and extension of Golomb coding) to processes for converting source image data to compressed image data;
  • specifies extensions to processes for converting compressed image data to reconstructed image data including an extension for sample transformation for inverse color transforms;
  • specifies coded representations for compressed image data;
  • provides guidance on how to implement these processes in practice.

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